Improved grates



UNITED STATES PATENT OFFICE.

LooMIs e. MARSHALL, on MOKENA, ILLINOIS, ASSIGNoE To HIMSELE AND E. w. HUGHES.

IMPROVED GRATES.

Specification `forming part of Letters Patent No. L15,94 S, dated lIanuary 17, 1865.

To all whom it may concern,.-

Be it known that I, LOOMIS G. MARSHALL, ot' Mokena, Will county, State of Illinois, have invented new and useful Improvements in Gone-Shaped Grates for Burning Goal-Dust; and I do hereby declare the following to be an exact description thereof', reference being had to the accompanying drawings, and to the letters of reference marked thereon, Inaking a part of this specification.

The nature of my invention is the slats or bars yof a conical or angular shaped grate, made to incline downward l'ronI the center, having a plate or base, with an aperture in the bottom, to allow the draft to pass upward and ettectually burn coal-dust.

Figure l represents a sectional view ot' the h lliw cone with its aperture underneath. Fig. 2 represents a side section of the angularshaped grate. Fig. 3 represents a sectional end View of the angular shaped grate, showin g the slanting bars or slats.

I make the grate an upright'one, of castiron, either an gular-shaped or conical, and when conical I use a series of cones in the tire-place of a furnace, engine, or stove, for the purpose of burning coal-dust.

I term the gratesof slats or bars A A, sloping or inclining from the inside or center ofthe grate, to the outside, withintermediate stays, B B, to ei'ectually prevent the coal dust from choking up the grate or falling through between the bars, while the aperture G at thev bottom plate or base admits the free access o air and a clear draft through the center of the" grate, whose spaces D D, between the barsV A, form downward slopes, so that the coaldust cannot pass through, but must all be consumed in the tire-place.

Heretotore the coal-dust has tilled up the draft holes or spaces of the grates, and the coal-dust fell through below or choked 11p the grates, without having sufficient drait to make the re or keep it going, and the coal-dust, when burning, giving out, as it does, a greater dame than in lumps, soon destroys the grates, that are perpendicular bars and stationary, and the grate of one stove not tting to any other stove makes the stove useless.

My grates are movable and made to suit any kind ot' a stove or fire-place, either round or square.

I am well aware that cone-shaped and cylindrical grates with holes have been used, but these I do not claim as my invention there fore What I claim as my invention, and desire to secure by Letters Patent, is-

A conical or angular shaped grate formed of bars sloping from the inside to outside, as herein described and for the purposes set forth.

LOOMIS G. MARSHALL.

Witnesses:

GUY E. FARQUIIAII, IVANHOE S. HUBER. 

